Refactored DB to be Series->Volumes->Chapters instead. All functionality that previously worked still works. Cleanup still needed.

API/Entities/FolderPath.cs

@@ -1,10 +1,18 @@
 
+using System;
+
 namespace API.Entities
 {
     public class FolderPath
     {
         public int Id { get; set; }
         public string Path { get; set; }
+        /// <summary>
+        /// Used when scanning to see if we can skip if nothing has changed.
+        /// </summary>
+        public DateTime LastScanned { get; set; }
+        
+        // Relationship
         public Library Library { get; set; }
         public int LibraryId { get; set; }
     }